Change-speed and reversing gear.



No- 857,102. PATENTED JUNE 18, 1907. J. R. PARANT.

CHANGE SPEED AND REVERSING GEAR. APPLICATION mum JAN. 17, 1907.

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JULES RENE PARANT, E NEUILLY-SUR-SEINE, FRANCE.

CHANGE-SPEED AND REVERSING GEAR.

Specification of Letters Patent.

Patented June 18, 1907.

Application filed January 17.1907. Serial No. 352,806.

To all whom it may concern:

Be it known that I, JULEs RENE PARANT, a citizen of the Republic ofFrance, residing at Neuilly-sur-Seine, in the Republic of France, haveinvented certain new and useful Improvements in Change-Speed and Reversing Gears, of which the following is a specification.

This invention relates to change speed and reversing gears of which theessential characteristic consists in the movement being transmitted tothe driven shaft, whether differential or other, solely by means of apinion arranged in combination with the driving shaft in such mannerthat it can be either rendered independent of the same for re ducedspeeds or be secured to it for high speed which is thus transmitted indirect engagement, but without any division of the said driving shaft;in every case the wheel gear in action being the only one that is movingthe others remaining disengaged and standing still.

In the accompanying drawing :Figure 1 is a vertical section of themechanism on line A-A of Fig. 2, which itself is a horizontal section online BB of the said Fig. 1.

This mechanism comprises a gear casing made in two adjustable parts,bottom 1 and cover 2, in which all the operative parts are mounted, moreparticularly two parallel shafts 3 4 supported respectively at theirends by ball bearings 5, 6 and 7, 8.

The shaft 3 can be connected by means of a square sleeve 9 with which itis provided, and by any suitable means, to the driving shaft. At its endopposite the square sleeve 9, the shaft 3 passes freely through the hubof a-pinion 10 which rotates concentrically with,

and independently of, the said shaft 3; this pinion engages by means ofthe outer circumference of its hub, with ball bearings 11 fitted betweenthe corresponding portions of a wall 12 of the gear case, and of a strap13 secured to the said wall, independently of the cover 2. The pinion 10engages with another pinion 14 secured to the driven shaft 15, which inthe example illustrated, is a sleeve formed integral with the casing ofthe differential gear 16 of a motor car. The sleeve or hollow spindle15, in which rotate the sections of the shaft 17, itself rotates freelyin the ball bearings 18 19 mounted in the gear case.

The two shafts 3 and 4 are each made along a portion of their length ofsquare cross-section, on which can slide freely two sleeves 20 21 whichare thus caused to participate in the movement of rotation of the saidspindles.

In the example illustrated, the gears for the various reduced speeds areconstituted by toothed wheels which are always in engagement: 22 23 forthe first speed, 24 25 for the second, 26 27 for the third etc., thediameters of the said wheels being proportioned accordingly. The saidWheels are mounted in such manner that they are disengaged from andindependent of the shafts 3 and 4, passing through them, and aresupported by the outer circumference of their hubs, resting on ballbearings 28 fitted in independent rings 29 adjustable in the gear case.

In order to connect each gear couple, first to the driving shaft 3, andthen to the intermediate shaft 4, the hubs of the wheels 22 to 27, areprovided inside with recessed nuts 30, with which can engagecorresponding nuts 31 made at one end of each of the sleeves 20 and 21.

The movements along their respective shafts of the said two sleeves 2021 are brought about simultaneously by means of a double fork 32 whichcan be operated from the outside by means of a lever 33 acting on aninner finger 34.

The transmission of the driving movement at reduced speed to the drivenshaft 15, takes place in the following manner.

Behind the pinion 10, and concentrically with the driving shaft 3, ismounted loose on the said spindle, by means of ball bearings 35supporting the outer circumference of its hub, a toothed wheel 36engaging with another wheel 37 secured to the intermediate shaft 4. Atits inner circumference, the wheel 36 is provided with a recessed nut 38with which co-operates another nut 39 formed on a sleeve 40 looselymounted on the plain portion of the driving shaft 3, the said sleevealways remaining in engagement with the hub of the pinion 10, but beingcapable of sliding in the interior of the same. To this end the sleeve40 is provided with another nut 41, capable of longitudinally slidingalong corresponding portions of a grooved nut 42, formed on the interiorof the pinion 10, without getting out of engagement with the said nut 42in any position which the said sleeve 40 can occupy. Longitudinalmovements of the sleeve 40 are obtained by means of a fork 43, securedto a sleeve 44 capable of sliding in a direction parallel to theshaft'3,

shaft 4.

on a fixed rod 45, and operated from the outside by means of a lever 47l/Vhen the fork 43 is operated in such manner that the nut 39 of thesleeve 40 is brought into engagement with the nut 38 of the wheel 36,the latter is connected to the pinion 10, in such manner that thereduced speed, which is being transmitted to the intermediate spindle 4by that set of toothed wheels which at that time is in engagement withthe shafts 3 and 4:, will be transmitted to the driving shaft throughthe wheels 37 36 and the pinions 10 14.

When it is desired to obtain top speed by direct engagement, a nut 48formed on the driving shaft 3, is brought into engagement with anothernut 49 formed in the interior of the sleeve 40. In the position which isthen occupied by the parts, the pinion 10 still remains in engagementwith the sleeve 40 which is then disengaged from the wheel 36, so thatthe intermediate shaft 4 and the parts supported by it, are not inconnection with the driving shaft 3, and remain standing still.

The transmission of movement in direct engagement, is therefore,obtained by means of a spindle made in one piece, passing right throughthe pinion receiving the movement, to which it is connected by acoupling sleeve, the special and characteristic combination of whichenables the said driving shaft to be disengaged from the pinion fortransmitting movement at reduced speed, as already explained.

Backward driving is obtained by the combination of parts hereinafterdescribed which remain disengaged from and independent of all the otherparts for speeds in forward driv- 111 On a rod 50, suitably supported infixed position in the gear case, can slide a gear of two toothed wheels51 52, intended respectively to engage, at the moment of reversing, thewheel 51 with a pinion 53 keyed to the driving shaft 3, and the wheel 52with another pinion 54 secured to the intermediate The shifting of thewheel gearing 51 52, is effected by means of a finger 55 operated fromthe outside by the central lever 56.

In the position into which the wheels 51 52 are brought for reversing,the sleeve 40 is disengaged from the driving shaft 3 and brought 36 ofreduced speeds.

What I claim as my invention and desire to secure by Letters Patent is:

1. In a change speed and reversing gear and in combination a drivenshaft, a toothed wheel thereon, a second toothed wheel in constantengagement therewith, a third toothed wheel adapted to be driven througha reducing speed gear, a driving shaft in one piece passing through thehubs of said second and third wheels but not in contact thereand incombination a driven shaft, a toothed wheel fixed thereon, a drivingshaft in one piece, a second toothed wheel at one end of said shaftconcentric thereto with a hub surrounding said shaft but not in'contacttherewith and supported by ball bearings on the exterior of its hub, athird toothed wheel mounted adjacent to and in similar manner to saidsecond wheel, a sleeve mounted loosely on said driven shaft extendingwithin the hubs of said wheels, engaging means between said sleeve andthe hub of said second toothed wheel so that they always rotate together but the sleeve is capable of longitudinal movement relatively tosaid wheel hub, means to engage said sleeve and said third toothed wheelat a certain longitudinal position of said sleeve, means to engage saidsleeve with the shaft to rotate therewith, means controlled by theoperator to move said sleeve longitudinally to engage it either withsaid third wheel or with the shaft, an intermediate shaft, a toothedwheel on said shaft in constant engagement with said third toothedWheel, a series of reducing gears each comprising two toothed wheels inconstant engagement one with the other and mounted respectivelyconcentric to and surrounding the intermediate shaft and the drivingshaft, but not in contact therewith and supported on ball bearingsengaging the exterior of their hubs, two sleeves mounted respectively onsaid driving shaft and said intermediate shaft so as to rotate therewithand be capable of longitudinal movement thereon, each sleeve extendingwithin the hubs of the respective toothed wheels of said reducing gears,engaging means between each sleeve and the hubs of the respectivetoothed wheels so arranged that longitudinal move ment of each sleeveplaces it in engagement with one of the wheels, and means under thecontrol of the operator to shift both of said sleeves.

3. In a change speed and reducing gear and in combination a drivenshaft, a toothed wheel fixed thereon, a driving shaft in one piece, asecond toothed wheel at one end of said shaft concentric thereto with ahub surrounding said shaft but not in contact therewith and supported byball hearings on the exterior of its hub, a third toothed wheel mountedadjacent to and in similar manner ICC IIO

to said second wheel, a sleeve mounted loosely on said driven shaftextending within the hubs of said wheels, engaging means between saidsleeve and the hub of said second toothed wheel so that they alwaysrotate together but the sleeve is capable of longitudinal movementrelatively to said wheel hub, means to engage said sleeve and said thirdtoothed wheel at a certain longitudinal position of said sleeve, meansto engage said sleeve with the shaft to rotate therewith,

means controlled by the operator to move said sleeve longitudinally toengage it either with said third wheel or with the shaft, anintermediate shaft, a toothed wheel on said shaft in constant engagementwith said third toothed wheel, a series of reducing gears eachcomprising two toothed wheels in constant engagement one with the otherand mounted respectively concentric to and surrounding the intermediateshaft and the driving shaft, but not in contact therewith and supportedon ball bearings engaging the exterior of their hubs, two sleevesmounted respectively on said driving shaft and said intermediate shaftso as to rotate therewith and be capable of longitudinal movementthereon each sleeve extending within the hubs of the respective toothedwheels of said reducing gears, engaging means between each sleeve andthe hubs of the respective toothed wheels so arranged that longitudinalmovement of each sleeve places it in engagement with one of the wheels,means under the control of the operator to shift both of said sleeves, areversing gear comprising a toothed wheel on the driving shaft and oneon the intermediate shaft and wheels carried on an independent shaftadapted under the control of the operator to place said toothed wheelsin operative connection.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JULES RENE PARANT. WVitnesses H. C. CoXE, GEORGES BONNEUIL.

